Jerk hammer for metal working



y 14, 1957 c. R. GUYTON 2,791,926

JERK HAMMER FOR METAL WORKING Filed Feb. 24, 1956 Char/es R. Guyfon INVENTOR.

United States Patent JERK HAMMER FGR METAL WORKING Charles R. Guyton, McLean, Tex., assignor of fifty percent to Harold D. McColum, McLean, Tex.

Application February 24, 1956, Serial No. 567,563

2 Claims. I (CI. 8115) This invention generally relates to an impact instrument and more specifically provides a jerk hammer for metal working and is specifically adapted for use in conjunction with body and fender work when repairing deformed metal in an automobile or similar vehicle.

Due to the particular construction of the majority of the automotive vehicle bodies, such bodies often become bent, misshapened or deformed by contact with other vehicles, stationary objects or the like. There have been many tools provided for straightening and reforming the various body and fender panels. However, there has been no tool provided for pulling outwardly on an inwardly deformed piece of metal since the inwardly deformed piece of metal has usually been reformed by engagement with the inner surface thereof. In certain areas of the vehicle body and especially in the door panels, it is extremely difiicult to gain access to the inner surfaces of the body panels due to various structural elements which are permanently formed on the body panels. Accordingly, it is the primary object of the present invention to provide a jerk hammer for straightening and pulling out inwardly bent portions or inwardly creased portions of vehicle bodies.

Another object of the present invention is to provide a jerk hammer for straightening inwardly deformed portions of metal such as in a vehicle body wherein a sheet metal screw is inserted into the metal and then attached to an impact type of hammer for urging the inwardly bent metal outwardly after which the metal screw may be removed and the aperture formed thereby may be leaded for providing a proper finish.

Other objects of the present invention will reside in its simplicity of construction, ease of operation, adaptation for its particular purposes and its relatively inexpensive manufacturing cost.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view of the jerk hammer of the present invention being employed in the desired manner;

Figure 2 is a longitudinal, vertical sectional view taken substantially upon a plane passing along section line 2-2 of Figure 1 illustrating the details of construction of the jerk hammer and illustrating the relationship of the slidable weight on the tubular shank;

Figure 3 is an enlarged view illustrating the relationship of the end of the flexible chain and the sheet metal screw; and

Figure 4 is a persective view of the U-shaped member having inturned end portions attached to the end of the flexible chain for engaging the sheet metal screw.

Referring now specifically to the drawings, the numeral generally designates the jerk hammer of the present Ice 2,791,926

' on an inwardly deformed or bent portion 12 of a vehicle body panel generally designated by the numeral 14.

The jerk hammer 10 generally includes an elongated cylindrical tubular shank 16 in the form of a section of pipe that is provided with an externally threaded end portion 18 to which is attached a reducer coupling or nipple 20 having internally threaded end portions with one of the threaded end portions engaging the threaded portion 18 of the shank 16. Threadedly engaged with the other end of the reduced coupling 20 is a tubular cylindrical handle member 22 in the form of a pipe nipple having each end thereof externally threaded wherein one end.

engages the small end of the reducer coupling 20 and the other end is engaged by an internally threaded closure cap 24.

The end of the shank 16 remote from the reducer coupling 20 is provided with a reducer bushing 26 having a threaded portion 28 engaging the end of the shank 16. An elongated flexible member in the form of a chain 32 is attached to bushing 28 as by welding 30 an end link 33 thereto and has the free end thereof attached to a U-shaped lug 34 on the bight portion 36 of a U-shaped member generally designated by the numeral 38 wherein the legs 40 thereof are provided with inturned portions 42 which terminate in spaced opposed relation for attachment to a sheet metal screw 44. The sheet metal screw 44 is provided with the usual head 46 having a screw driver receiving slot 48 therein.

A tubular sleeve 50 is slidably disposed on the elongated shank 16 and is provided with a smooth peripheral surface forming a hand grip whereby the sleeve 50 forms a weight for engagement with the end of the coupling or bushing 20 which forms an abutment for receiving impact due to sliding movement of the sleeve 50 whereby the handle 22 permits the tool 10 to be held in the desired position.

In straightening out an inwardly bent crease, a plurality of holes may be formed in the panel 12 after which sheet metal screws 44 may be inserted therein with the head 46 spaced from the panel 12 to permit attachment of the U-shaped member 38 after which the sleeve 50 may be moved rapidly against the abutment formed by the coupling 20 thereby pulling the inwardly bent panel portion 12 outwardly to the desired point. After the panel is straightened, the holes formed by the screws 44 may be leaded in in a manner well known in the body repair industry.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A tool for metal working comprising an elongated shank, a flexible member attached to one end of said shank, an abutment adjacent the other end of said shank, a slidable weight mounted on said shank for impact engagement with the abutment, and means on the free end of the flexible member for attachment to deformed metal whereby the metal may be reformed, said means including a sheet metal screw extending through the deformed metal, a head on said screw in spaced relation to the metal, and a U-shaped member having inturned leg portions terminating in opposed spaced relation for positioning between the metal and the screw head, said U-shaped member having the bight portion attached to the flexible Patented May 14, 1957 member whereby impact .force "may be employed for straightening the metal.

2. A tool for metal working comprising an elongated shank,- a flexible member attached to one end of said shank, an abutment adjacent the other end of .said shank, a slidable weight mounted on said shankfor impact engagement with the abutment, and means'on the free end of the flexible member for attachment to deformed metal whereby the metal may be reformed, s'aid shank having a longitudinally extending handle extending: outwardly from said abutment for controlling the position of the tool, said means including asheetmetal .screw extending through the deformed metal, a head on said screw in spaced relation to the metal, and a U-shap'ed member having inturned leg portions terminating in opposed spaced relation for positioning between the metal .and

the screw head, said U-shaped member having the bight portion attached to the flexible member whereby impact force may be employed for straightening the metal.

References Cited in the file of this patent UNITED STATES PATENTS 

